Circular calendar



FIG. 1 is a front elevational view of a circular calendar showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a side elevational view thereof; and,

FIG. 4 is a top plan view thereof.

The broken line showing indicia is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a circular calendar, as shown and described. 